Cross-site scripting in osTicket - CVE-2019-11537

Detailed vulnerability description

The vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data when processing data passed via /upload/file.php, /upload/scp/users.php?do=import-users, and /upload/scp/ajax.php/users/import if an agent manager user uploads a crafted .csv file to the User Importer, because file contents can appear in an error message. The XSS can lead to local file inclusion. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

How to mitigate CVE-2019-11537

Sources

• https://github.com/osTicket/osTicket/pull/4869
• https://github.com/osTicket/osTicket/releases/tag/v1.12
• https://pentest.com.tr/exploits/osTicket-v1-11-XSS-to-LFI.html
• https://www.exploit-db.com/exploits/46753
• https://www.exploit-db.com/exploits/46753/